Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 97  ·  NGC 3587  ·  Owl Nebula  ·  PK148+57.1
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NGC 3587, HOO, Cedric Raguenaud
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Getting plate-solving status, please wait...
NGC 3587, HOO, Cedric Raguenaud
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Data and processing: Cedric Raguenaud (http://raguenaud.space)

The SBIG is less sensitive to OIII than Ha. So this time I went for about 2/3 OIII and 1/3 Ha. Especially since NGC 3587 has very little Ha.

It's the first time I see a OIII halo around the nebula.

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